Ratchet-drill



F. H. PIERSON.

RATCHET DRILL.

APPLICATION FILED MAR. 3. 1919.

Patented Sept. 9, 1919.

F. H. PIERSON.

RATCHET DRILL. APPLICATION FILED MAR. 3, 19l9.

1,315,638. PatentedSept. 9,1919.

2 SHEETSSHEET 2.

rm: coLQmIIA rLANouIArn to. WASHINGTON. n. c.

UNITED STATES PATENT OFFICE.

rnonn H. PIERSON, or NEW HAVEN, CONNECTICUT,

RATCHET-DRILL.

specification of Lettersratent. Patented Sept, 9, 1919.

Application filed Marc a, 1919. anno. 280,444.

To all whom it may concern Be it knmvn that I, Fnoon H. PIERSON, acitizen of theUnited States, residing at New Haven, in the "county ofNew Haven and State of Connecticut, have invented a new and useful Imnovement in Ratchet-Drllls; and I do hereby declare the following, whentaken in connection with the accompanying drawings and the characters ofreference marked thereon, to be a full, clear, and enact description ofthe same, and Wlllffill sa d drawings constitute part of thisapplicatlon, and represent, in-- v j Figure 1 a sile view of a ratchetdrill constructed in accordance with my invention, the end of thehandlebelng broken away. l l pp n Fig. 2 an underside view oi the same.

Fig. 3 a top or plan view thereof I Fig. l a sectional view on the l nei -d of Fig. 3. l V

Fig. 5 a broken view illustrat ngthe operation of the feeding pawl.

Fig. 6 a side view of a modified form of operating nut.

This invention relates to an improvement in ratchet drills andparticularly to ratchet. drills adapted to be operated 'byhand and whereconsiderable power is necessary, the object of the invention being toprovide means whereby the drill is not only turned to cut, but the drillis fed longitudinally so as to continue the cutting without other meansfor feeding; and the invention consists in the construction hereinafterdescribed ancl particularly recited in the claims.

In carrying out my invention, I employ a head 10 recessed to form achamber 11 and provided at its upper edge with an outwardly projectingflange 12. Extend ng through the lower end 13 of the chamber 1s athreaded post 1 1 of a chuck 15 adapted to receive and contain a drill16. On thls threaded post is a long nut 17 which projects upward abovethe upper end of the head and on this nut, which is angular, 1s aratchet washer 18 by which the nut may be turned and through which thenut may have longitudinal movement. This ratchet rests upon the upperedge of the head andrmay be held securely in connection therewith bymeans of a dog 19. Mounted around the head is a collar 20 which bearsagainst the underside of the flange 18 and held 1n place by a lock-nut21 so that the collar is free to rotate. This collar is formed on oneside with an outwardly projecting lug 22 in which is mountedan upwardlyprojecting pin and the collar is also formed with an outwardlyprojecting boss 2 1 formed with a chamber 25'and with anopening 261mmthe chamber through the outer end of the 'boss. In this chamber is aradiallymovable pawl 27 adapted to engage with ratchet teeth 28 on theoutersurface of the upper part ofthe head. This ratchet is formed with astem 29 projectingoutward through the opening 26, and in the projectingend of the stem is a handle pin 30 adapted to ride upon the end of theboss or enter" the notch 31therein so as to permit the pawl to engagewith the teeth on the head or bewithrawn for engagement therewitlnthepawl being normally forced into engagement with the ratchet by means ofa spring 32. Mounted upon the pin 23 is a handle 33, tl is lian-- dlebeing formed with a segmental arm 34: in

which is mounted an adjusting screw 35 for the purpose as willhereinafter appear, and

also connected with the handle is a pawl 36 adapted to engage with theteeth ofthe. i

ratchet washer 18. This pawl is normally held an engagement with itsratchet j'by means 0t a s'pring actuated plunger37 mounted Inthe end ofthe handle inline with the hub 38 of the pawl which isformed with anotch 39 into which the end of the plunger 37 may enter so as to lockthe pawl out of engagement with the ratchet washer 18. Mounted in theupper end of the nut 17 is a centering point 40, and it may here bementioned that the terms upper and lower are relative terms as thedevice may be operated in any position. The ratchet drill is used inconnection with a frame or holder of some kind consisting of a bearingll for the point 10 and an anvil 42 upon which the work may rest.

In operation the handle is first turned until the end of the screw 35comes in con tact with the side of the collar or with the side of thelug thereon, and the time of contact will be determined by adjusting thescrew 35. This movement determines the ratchet washer 18, turns the nut17 on the stem 14 of the chuck 15 so as to turn the nut off from thestem so as to extend the point 40 and force it against its bearlng 4:1,or in other words, to force-the drill downward without turning it. Thehandle then comes into contact wlth the collar 20, and as the pawl 24 isin engagement with the teeth 28 that collar will be turned so as to turnthe head and with it. the chuck and the drill.

For the purpose of adjustment the pawl 24 may be withdrawn so that thecollar is free to be turned on the head without moving the drill. Itwill thus be seenthat in the first movement of the handle the drill isfirst advanced and then the power applied for cutting. While I prefer toform the ratchet washer separate from the nut, the nut itself may becircular in cross-section and formed with ratchet teeth 43 as shown inFig. 6 of the drawings, the pawlcoacting with these teeth in the sameway as with the teeth on the ratchet washer, the operation of the devicebeing exactly the same in both cases. v a l I claiini- I 1. A ratchetdrill comprisin' a head pro vided with external ratchet teet and formedwith a chamber, a chuck connected with said head and formed with athreaded post extending upward through said chamber, a

" nut on said post, a collar mounted on said head, a pawl carried bysaid collar and engaging ith the teeth on the head, a handle piyotall'yconnected with said collar and adapted to turn the same, a pawl mountedon said handle and adapted to turn said nut.

2. formed with a chamber and with external ratchet teeth, a chuckconnected with said head and formed with a threaded post ex- A ratchetdrill comprising a head i tending upward through said chamber, a nut onsaid post, a collar surrounding said head, a spring-actuated pawlmounted in said collar and adapted to engage with the ratchet teeth onthe head, said collar formed 7 with an outwardly projecting arm, a pincarried by said arm, a handle mounted on said pin, an adj ustin screwmounted in said handle and adapte to engage with said collar, a pawlalso mounted on said handle and adapted to turn said nut.

3. A ratchet drill comprising a head formed with a chamber with anoutwardly extending flange at its upper end and with external ratchetteeth, chuck connected with said head and formed with a threaded 0stextending upward through said champlunger adapted to hold said pawl inen gagement with the ratchet washer.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

FRODE H. PIERSON.

Witnesses:

FREDERIC C. EARLE, CLARA L. WEED.

copies at this patent may be obtained folfive cents each, by addressingthe Commissioner of Iatents, Washington, I). 0?

